If cos 21 = x/y , then (cosec 21 cos 69 ) is equal to

• A. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>x </center></td></tr><tr><td style="text-align: center;">y <span style=" text-decoration: overline;">y + x </span></td></tr></table>
• B. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>y </center></td></tr><tr><td style="text-align: center;">x <span style=" text-decoration: overline;">y - x </span></td></tr></table>
• C. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>y </center></td></tr><tr><td style="text-align: center;">x <span style=" text-decoration: overline;">x - y </span></td></tr></table>
• D. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>x </center></td></tr><tr><td style="text-align: center;">y <span style=" text-decoration: overline;">x - y </span></td></tr></table>